int64 idx 
float32 x # grid_x
float32 y # grid_y
float32 x_min # grid_x
float32 x_max
float32 y_min # grid_x
float32 y_max # grid_y
float32 z_intercept # zmax - zmin
float32 zmax
float32 zmin
float32 zmean 
float32 confidence
int64 points_num
int8 vaild # 0- no vaild 1-vaild
float64 time